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Q1142. Does compiler treats it differently if we don't prefix this to the member element and its implicit as its the only variable available with that name ?
Ans. It makes no difference whether we add this to the variable or not. The only use of this is in the cases where there are multiple variables with the same name and we want to distinguish between the member variable and local variable. In case this is not added ,this is automatically added by the compiler in the byte code.
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Ans. Fail fast systems are intolerant systems that fails at the first instance of smelling any problem. The objective here is to break the system instead of continuing with the possibly flawed processing. Example could be breaking the processing upon an exception.
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Ans. Hadoop is an open source framework , written in java by apche software foundation. This framework is used to write applications to process vast amount of data. Processing happens in parallel on large clusters which could have 1000 of computers. It processes data in a very reliable and fault tolerant manner.
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Ans. One common usage is predictive analytic using huge current or past data. For example - Using recent medical data ( diagnosis and procedure ), one can identify the pattern of diseases or the procedures that has to eventually applied upon certain diagnosis. This analysis might help in predicting the diseases that might occur to a patient.
the other usage could be to identify the future spending patterns of the population by analyzing the past and current habits.
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Ans. Combiners are used to increase the efficiency of a Map Reduce program. They are used to aggregate intermediate map output locally on individual mapper outputs. Combiners can help you reduce the amount of data that needs to be transferred across to the reducers.
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Ans. <a href="http://www.programcreek.com/2009/02/diagram-for-hierarchy-of-exception-classes/" rel="nofollow">http://www.programcreek.com/2009/02/diagram-for-hierarchy-of-exception-classes/</a>
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Ans. Stored procedures are a batch of SQL statements along with programming constructs ( if else, loops etc ) and stored as a single program that can be called by different clients and hence reused.
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Ans. jQuery is a cross platform JavaScript library designed to simplify the client-side scripting of HTML. JQuery is the most popular JavaScript library.
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Q1158. Can we have try statement without catch? If try statement contains return will the finally block be executed? What happens if there is an exception inside finally block?
Q1162. There is a Table Student having Student Id, Name and Total Marks. Can you please write an SQL that will display the maximum marks obtained by a student ?
Q1165. Is it advisable to set the member variables through constructors instead of setting them through setters ?
Ans. Yes , If the values to be set are known at the time of initialization and doesn't involve polymorphic behavior.If it's using Dependency Injection , then Constructor injection must be available. If it suffice the above conditions, then definitely its advisable to have them set through constructor as they eagerly load the values into the memory and save it fro multiple values assignment ( one through default constructor and then through assignment )
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Q1166. What will happen if we have our own constructor but only initialize some of the member elements ?
Ans. Its always advisable to initialize all the member elements in case we don't use the compiler's default constructor as leftover member elements will have garbage values and may reflect and unstable state for the object.
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Ans. JRE or Java Runtime Environment is the Java Virtual Machine on which class files are executed. It includes borwser plugins that facilitates execution of class files in browsers.
JDK or Java Development Kit includes JRE , compiler and development tools.
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Q1169. Does Constructor returns the reference of the newly created object ?
Ans. No, New operator actually returns the reference of newly created object. Constructor's purpose is to initialize the default state of the object by setting the initial values of the elements and hence returns nothing.
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Q1170. Why doesn't Java even allow void return types for Constructors ?
Ans. Because having a void return type with the Constructor name will make it as a method name. As methods with the Class names are perfectly legit in Java, It needs some way to recognize the constructor and having none return type helps identify that.
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